Jimmy Presnell

Speaking of going through it on "Love is Blind" ... he gave us an update on his relationship with Chelsea Blackwell -- who he got engaged to during their season, and notoriously had a bumpy ride with her after they exited the pods.

"Love is Blind" star Jimmy Presnell has jaws on the floor -- and it has nothing to do with a dramatic love triangle. He's looking like a whole new person after hitting the gym and going in for a hair transplant -- and tells TMZ he has 'LIB' to thank for pushing him out of his comfort zone.